#include <stdio.h>
#include <stdlib.h>
int main()
{
 pid_t id = fork();
 if(id < 0){
  perror("fork");
  return 1;
 }
 else if(id > 0){ //parent
  printf("parent[%d] is sleeping...\n", getpid());
  sleep(30);
 }
 else{
  printf("child[%d] is begin Z...\n", getpid());
  sleep(5);
  exit(EXIT_SUCCESS);
 }
 return 0;
}
